types/sequence.c

   1 /*
   2  * sequence.c
   3  *
   4  * BabelTrace - Sequence Type Converter
   5  *
   6  * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  */
  18
  19 #include <babeltrace/compiler.h>
  20 #include <babeltrace/format.h>
  21
  22 #ifndef max
  23 #define max(a, b)       ((a) < (b) ? (b) : (a))
  24 #endif
  25
  26 static
  27 struct definition *_sequence_definition_new(struct type *type,
  28                                         struct definition_scope *parent_scope);
  29 static
  30 void _sequence_definition_free(struct definition *definition);
  31
  32 void sequence_copy(struct stream_pos *dest, const struct format *fdest,
  33                    struct stream_pos *src, const struct format *fsrc,
  34                    struct definition *definition)
  35 {
  36         struct definition_sequence *sequence =
  37                 container_of(definition, struct definition_sequence, p);
  38         struct type_sequence *sequence_type = sequence->type;
  39         uint64_t i;
  40
  41         fsrc->sequence_begin(src, sequence_type);
  42         fdest->sequence_begin(dest, sequence_type);
  43
  44         sequence->len->p.type->copy(dest, fdest, src, fsrc,
  45                                     &sequence->len->p);
  46
  47         for (i = 0; i < sequence->len->value._unsigned; i++) {
  48                 struct definition *elem =
  49                         sequence->current_element.definition;
  50                 elem->type->copy(dest, fdest, src, fsrc, elem);
  51         }
  52         fsrc->sequence_end(src, sequence_type);
  53         fdest->sequence_end(dest, sequence_type);
  54 }
  55
  56 static
  57 void _sequence_type_free(struct type *type)
  58 {
  59         struct type_sequence *sequence_type =
  60                 container_of(type, struct type_sequence, p);
  61
  62         free_type_scope(sequence_type->scope);
  63         type_unref(&sequence_type->len_type->p);
  64         type_unref(sequence_type->elem);
  65         g_free(sequence_type);
  66 }
  67
  68 struct type_sequence *
  69         sequence_type_new(const char *name, struct type_integer *len_type,
  70                           struct type *elem_type,
  71                           struct type_scope *parent_scope)
  72 {
  73         struct type_sequence *sequence_type;
  74         struct type *type;
  75
  76         sequence_type = g_new(struct type_sequence, 1);
  77         type = &sequence_type->p;
  78         assert(!len_type->signedness);
  79         type_ref(&len_type->p);
  80         sequence_type->len_type = len_type;
  81         type_ref(elem_type);
  82         sequence_type->elem = elem_type;
  83         sequence_type->scope = new_type_scope(parent_scope);
  84         type->id = CTF_TYPE_SEQUENCE;
  85         type->name = g_quark_from_string(name);
  86         type->alignment = max(len_type->p.alignment, elem_type->alignment);
  87         type->copy = sequence_copy;
  88         type->type_free = _sequence_type_free;
  89         type->definition_new = _sequence_definition_new;
  90         type->definition_free = _sequence_definition_free;
  91         type->ref = 1;
  92         return sequence_type;
  93 }
  94
  95 static
  96 struct definition *_sequence_definition_new(struct type *type,
  97                                 struct definition_scope *parent_scope)
  98 {
  99         struct type_sequence *sequence_type =
 100                 container_of(type, struct type_sequence, p);
 101         struct definition_sequence *sequence;
 102         struct definition *len_parent;
 103
 104         sequence = g_new(struct definition_sequence, 1);
 105         type_ref(&sequence_type->p);
 106         sequence->p.type = type;
 107         sequence->type = sequence_type;
 108         sequence->p.ref = 1;
 109         sequence->scope = new_definition_scope(parent_scope);
 110         len_parent = sequence_type->len_type->p.definition_new(&sequence_type->len_type->p,
 111                                                                 parent_scope);
 112         sequence->len =
 113                 container_of(len_parent, struct definition_integer, p);
 114         sequence->current_element.definition =
 115                 sequence_type->elem->definition_new(sequence_type->elem,
 116                                                      parent_scope);
 117         return &sequence->p;
 118 }
 119
 120 static
 121 void _sequence_definition_free(struct definition *definition)
 122 {
 123         struct definition_sequence *sequence =
 124                 container_of(definition, struct definition_sequence, p);
 125         struct definition *len_definition = &sequence->len->p;
 126         struct definition *elem_definition =
 127                 sequence->current_element.definition;
 128
 129         len_definition->type->definition_free(len_definition);
 130         elem_definition->type->definition_free(elem_definition);
 131         free_definition_scope(sequence->scope);
 132         type_unref(sequence->p.type);
 133         g_free(sequence);
 134 }